-/**/
+/*
+ * query.c
+ * - overall query management (allocation, completion)
+ * - per-query memory management
+ * - query submission and cancellation (user-visible and internal)
+ */
+/*
+ * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
#include "internal.h"
-adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
- adns_rrtype type, adns_queryflags flags, int *qml_r) {
- int ll, c, nlabs, qbufreq;
- unsigned char label[255], *nqbuf;
- const char *p, *pe;
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
-#define MKQUERY_ADDB(b) *nqbuf++= (b)
-#define MKQUERY_ADDW(w) (MKQUERY_ADDB(((w)>>8)&0x0ff), MKQUERY_ADDB((w)&0x0ff))
+#include <sys/time.h>
- qbufreq= 12+strlen(owner)+3;
- if (ads->qbufavail < qbufreq) {
- nqbuf= realloc(ads->qbuf,qbufreq);
- if (!nqbuf) return adns_s_nolocalmem;
- ads->qbuf= nqbuf; ads->qbufavail= qbufreq;
- }
- nqbuf= ads->qbuf;
+#include "internal.h"
+
+int adns__internal_submit(adns_state ads, adns_query *query_r,
+ const typeinfo *typei, vbuf *qumsg_vb, int id,
+ adns_queryflags flags, struct timeval now,
+ adns_status failstat, const qcontext *ctx) {
+ adns_query qu;
+
+ qu= malloc(sizeof(*qu)); if (!qu) goto x_nomemory;
+ qu->answer= malloc(sizeof(*qu->answer)); if (!qu->answer) goto x_freequ_nomemory;
+
+ qu->ads= ads;
+ qu->state= query_udp;
+ qu->back= qu->next= qu->parent= 0;
+ LIST_INIT(qu->children);
+ qu->siblings.next= qu->siblings.back= 0;
+ LIST_INIT(qu->allocations);
+ qu->interim_allocd= 0;
+ qu->final_allocspace= 0;
+
+ qu->typei= typei;
+ adns__vbuf_init(&qu->vb);
+
+ qu->cname_dgram= 0;
+ qu->cname_dglen= qu->cname_begin= 0;
- MKQUERY_ADDW(id);
- MKQUERY_ADDB(0x01); /* QR=Q(0), OPCODE=QUERY(0000), !AA, !TC, RD */
- MKQUERY_ADDB(0x00); /* !RA, Z=000, RCODE=NOERROR(0000) */
- MKQUERY_ADDW(1); /* QDCOUNT=1 */
- MKQUERY_ADDW(0); /* ANCOUNT=0 */
- MKQUERY_ADDW(0); /* NSCOUNT=0 */
- MKQUERY_ADDW(0); /* ARCOUNT=0 */
- p= owner; pe= owner+ol;
- nlabs= 0;
- if (!*p) return adns_s_invaliddomain;
- do {
- ll= 0;
- while (p!=pe && (c= *p++)!='.') {
- if (c=='\\') {
- if (!(flags & adns_f_anyquote)) return adns_s_invaliddomain;
- if (ctype_digit(p[0])) {
- if (ctype_digit(p[1]) && ctype_digit(p[2])) {
- c= (*p++ - '0')*100 + (*p++ - '0')*10 + (*p++ - '0');
- if (c >= 256) return adns_s_invaliddomain;
- } else {
- return adns_s_invaliddomain;
- }
- } else if (!(c= *p++)) {
- return adns_s_invaliddomain;
- }
- }
- if (!(flags & adns_f_anyquote)) {
- if (ctype_digit(c) || c == '-') {
- if (!ll) return adns_s_invaliddomain;
- } else if ((c < 'a' || c > 'z') && (c < 'A' && c > 'Z')) {
- return adns_s_invaliddomain;
- }
- }
- if (ll == sizeof(label)) return adns_s_invaliddomain;
- label[ll++]= c;
- }
- if (!ll) return adns_s_invaliddomain;
- if (nlabs++ > 63) return adns_s_invaliddomain;
- MKQUERY_ADDB(ll);
- memcpy(nqbuf,label,ll); nqbuf+= ll;
- } while (p!=pe);
+ qu->id= id;
+ qu->flags= flags;
+ qu->udpretries= 0;
+ qu->udpnextserver= 0;
+ qu->udpsent= qu->tcpfailed= 0;
+ timerclear(&qu->timeout);
+ memcpy(&qu->ctx,ctx,sizeof(qu->ctx));
+ qu->expires= now.tv_sec + MAXTTLBELIEVE;
- MKQUERY_ADDB(0);
- MKQUERY_ADDW(type & adns__rrt_typemask); /* QTYPE */
- MKQUERY_ADDW(1); /* QCLASS=IN */
+ qu->answer->status= adns_s_ok;
+ qu->answer->cname= 0;
+ qu->answer->type= typei->type;
+ qu->answer->nrrs= 0;
+ qu->answer->rrs= 0;
+ qu->answer->rrsz= typei->rrsz;
+
+ *query_r= qu;
- *qml_r= nqbuf - ads->qbuf;
+ qu->query_dglen= qumsg_vb->used;
+ if (qumsg_vb->used) {
+ qu->query_dgram= malloc(qumsg_vb->used);
+ if (!qu->query_dgram) {
+ adns__query_fail(qu,adns_s_nomemory);
+ return adns_s_ok;
+ }
+ memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used);
+ } else {
+ qu->query_dgram= 0;
+ }
+ qu->vb= *qumsg_vb;
+ adns__vbuf_init(qumsg_vb);
+ if (failstat) {
+ adns__query_fail(qu,failstat);
+ return adns_s_ok;
+ }
+ adns__query_udp(qu,now);
+ adns__autosys(ads,now);
+
return adns_s_ok;
+
+ x_freequ_nomemory:
+ free(qu);
+ x_nomemory:
+ adns__vbuf_free(qumsg_vb);
+ return adns_s_nomemory;
}
-static void quproc_tosend_tcp(adns_state ads, adns_query qu, struct timeval now) {
- unsigned char length[2];
- struct iovec iov[2];
+int adns_submit(adns_state ads,
+ const char *owner,
+ adns_rrtype type,
+ adns_queryflags flags,
+ void *context,
+ adns_query *query_r) {
+ qcontext ctx;
+ int id, r, ol;
+ vbuf vb;
+ adns_status stat;
+ const typeinfo *typei;
+ struct timeval now;
- length[0]= (qu->querylen&0x0ff00U) >>8;
- length[1]= (qu->querylen&0x0ff);
+ typei= adns__findtype(type);
+ if (!typei) return adns_s_unknownrrtype;
- adns__tcp_tryconnect(ads);
- /* fixme: try sending queries as soon as server comes up */
- /* fixme: use vbuf_ensure, and preallocate buffer space */
- if (ads->tcpstate != server_ok) return;
-
- DLIST_UNLINK(ads->tosend,qu);
- timevaladd(&now,TCPMS);
- qu->timeout= now;
- qu->senttcpserver= ads->tcpserver;
- DLIST_LINKTAIL(ads->timew,qu);
-
- if (ads->opbufused) {
- r= 0;
- } else {
- iov[0].iovbase= length;
- iov[0].iov_len= 2;
- iov[1].iovbase= qu->querymsg;
- iov[1].iov_len= qu->querylen;
- r= writev(ads->tcpsocket,iov,2);
- if (r < 0) {
- if (!(errno == EAGAIN || errno == EINTR || errno == ENOSPC ||
- errno == ENOBUFS || errno == ENOMEM)) {
- adns__tcp_broken(ads,"write",strerror(errno));
- return;
- }
- r= 0;
- }
- }
+ ctx.ext= context;
+ ctx.callback= 0;
+ memset(&ctx.info,0,sizeof(ctx.info));
- if (r < qu->querylen+2) {
- newopbufused= qu->opbufused + qu->querylen + 2 - r;
- if (newopbufused > ads->opbufavail) {
- newopbufavail= ads->newopbufused<<1;
- newopbuf= realloc(newopbufavail);
- if (!newopbuf) {
- DLIST_UNLINK(ads->timew,qu);
- query_fail(ads,qu,adns_s_nolocalmem);
- return;
- }
- ads->opbuf= newopbuf;
- ads->opbufavail= newopbufavail;
- }
- if (r<2) {
- memcpy(ads->opbuf+ads->opbufused,length+r,2-r);
- ads->opbufused += (2-r);
- r= 0;
- } else {
- r -= 2;
- }
- memcpy(ads->opbuf+ads->opbufused,qu->querymsg+r,qu->querylen-r);
- ads->opbufused= newopbufused;
- }
+ r= gettimeofday(&now,0); if (r) return errno;
+ id= 0;
+
+ adns__vbuf_init(&vb);
+
+ ol= strlen(owner);
+ if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto xit; }
+
+ if (owner[ol-1]=='.' && owner[ol-2]!='\\') { flags &= ~adns_qf_search; ol--; }
+
+ stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags);
+
+ xit:
+ return adns__internal_submit(ads,query_r, typei,&vb,id, flags,now, stat,&ctx);
+}
+
+int adns_synchronous(adns_state ads,
+ const char *owner,
+ adns_rrtype type,
+ adns_queryflags flags,
+ adns_answer **answer_r) {
+ adns_query qu;
+ int r;
+
+ r= adns_submit(ads,owner,type,flags,0,&qu);
+ if (r) return r;
+
+ r= adns_wait(ads,&qu,answer_r,0);
+ if (r) adns_cancel(qu);
+
+ return r;
+}
+
+static void *alloc_common(adns_query qu, size_t sz) {
+ allocnode *an;
+
+ if (!sz) return qu; /* Any old pointer will do */
+ assert(!qu->final_allocspace);
+ an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
+ if (!an) return 0;
+ LIST_LINK_TAIL(qu->allocations,an);
+ return (byte*)an + MEM_ROUND(sizeof(*an));
+}
+
+void *adns__alloc_interim(adns_query qu, size_t sz) {
+ sz= MEM_ROUND(sz);
+ qu->interim_allocd += sz;
+ return alloc_common(qu,sz);
+}
+
+void *adns__alloc_mine(adns_query qu, size_t sz) {
+ return alloc_common(qu,MEM_ROUND(sz));
+}
+
+void adns__transfer_interim(adns_query from, adns_query to, void *block, size_t sz) {
+ allocnode *an;
+
+ if (!block) return;
+ an= (void*)((byte*)block - MEM_ROUND(sizeof(*an)));
+
+ assert(!to->final_allocspace);
+ assert(!from->final_allocspace);
+
+ LIST_UNLINK(from->allocations,an);
+ LIST_LINK_TAIL(to->allocations,an);
+
+ from->interim_allocd -= sz;
+ to->interim_allocd += sz;
+
+ if (to->expires > from->expires) to->expires= from->expires;
}
-void adns__quproc_tosend(adns_state ads, adns_query qu, struct timeval now) {
- /* Query must be on the `tosend' queue, and we guarantee to remove it.
+void *adns__alloc_final(adns_query qu, size_t sz) {
+ /* When we're in the _final stage, we _subtract_ from interim_alloc'd
+ * each allocation, and use final_allocspace to point to the next free
+ * bit.
*/
- struct sockaddr_in servaddr;
- int serv;
-
- if (qu->nextudpserver == -1) { quproc_tosend_tcp(ads,qu,now); return; }
- if (qu->querylen > UDPMAXDGRAM) {
- qu->nextudpserver= -1;
- quproc_tosend_tcp(ads,qu,now);
- return;
+ void *rp;
+
+ sz= MEM_ROUND(sz);
+ rp= qu->final_allocspace;
+ assert(rp);
+ qu->interim_allocd -= sz;
+ assert(qu->interim_allocd>=0);
+ qu->final_allocspace= (byte*)rp + sz;
+ return rp;
+}
+
+static void cancel_children(adns_query qu) {
+ adns_query cqu, ncqu;
+
+ for (cqu= qu->children.head; cqu; cqu= ncqu) {
+ ncqu= cqu->siblings.next;
+ adns_cancel(cqu);
}
-
- if (qu->udpretries >= UDPMAXRETRIES) {
- DLIST_UNLINK(ads->tosend,qu);
- query_fail(ads,qu,adns_s_notresponding);
- return;
+ LIST_INIT(qu->children);
+}
+
+void adns__reset_cnameonly(adns_query qu) {
+ assert(!qu->final_allocspace);
+ cancel_children(qu);
+ qu->answer->nrrs= 0;
+ qu->answer->rrs= 0;
+ qu->interim_allocd= qu->answer->cname ? MEM_ROUND(strlen(qu->answer->cname)+1) : 0;
+}
+
+static void free_query_allocs(adns_query qu) {
+ allocnode *an, *ann;
+
+ cancel_children(qu);
+ for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); }
+ adns__vbuf_free(&qu->vb);
+}
+
+void adns_cancel(adns_query qu) {
+ switch (qu->state) {
+ case query_udp: case query_tcpwait: case query_tcpsent:
+ LIST_UNLINK(qu->ads->timew,qu);
+ break;
+ case query_child:
+ LIST_UNLINK(qu->ads->childw,qu);
+ break;
+ case query_done:
+ LIST_UNLINK(qu->ads->output,qu);
+ break;
+ default:
+ abort();
+ }
+ free_query_allocs(qu);
+ free(qu->answer);
+ free(qu);
+}
+
+void adns__update_expires(adns_query qu, unsigned long ttl, struct timeval now) {
+ time_t max;
+
+ assert(ttl <= MAXTTLBELIEVE);
+ max= now.tv_sec + ttl;
+ if (qu->expires < max) return;
+ qu->expires= max;
+}
+
+static void makefinal_query(adns_query qu) {
+ adns_answer *ans;
+ int rrn;
+
+ ans= qu->answer;
+
+ if (qu->interim_allocd) {
+ ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
+ if (!ans) goto x_nomem;
+ qu->answer= ans;
}
- serv= qu->nextudpserver;
- memset(&servaddr,0,sizeof(servaddr));
- servaddr.sin_family= AF_INET;
- servaddr.sin_addr= ads->servers[serv].addr;
- servaddr.sin_port= htons(NSPORT);
+ qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans));
+ adns__makefinal_str(qu,&ans->cname);
- r= sendto(ads->udpsocket,qu->querymsg,qu->querylen,0,&servaddr,sizeof(servaddr));
- if (r<0 && errno == EMSGSIZE) {
- qu->nextudpserver= -1;
- quproc_tosend_tcp(ads,qu,now); return;
+ if (ans->nrrs) {
+ adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz);
+
+ for (rrn=0; rrn<ans->nrrs; rrn++)
+ qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz);
}
- if (r<0) warn("sendto %s failed: %s",inet_ntoa(servaddr.sin_addr),strerror(errno));
- DLIST_UNLINK(ads->tosend,qu);
- timevaladd(&now,UDPRETRYMS);
- qu->timeout= now;
- qu->sentudp |= (1<<serv);
- qu->nextudpserver= (serv+1)%ads->nservers;
- qu->udpretries++;
- DLIST_LINKTAIL(ads->timew,qu);
+ free_query_allocs(qu);
+ return;
+
+ x_nomem:
+ qu->answer->status= adns_s_nomemory;
+ qu->answer->cname= 0;
+ adns__reset_cnameonly(qu);
+ free_query_allocs(qu);
}
-void adns__query_fail(adns_state ads, adns_query qu, adns_status stat) {
+void adns__query_done(adns_query qu) {
adns_answer *ans;
-
+ adns_query parent;
+
+ qu->id= -1;
ans= qu->answer;
- if (!ans) ans= malloc(sizeof(*qu->answer));
- if (ans) {
- ans->status= stat;
- ans->cname= 0;
- ans->type= qu->type;
- ans->nrrs= 0;
+
+ if (ans->nrrs && qu->typei->diff_needswap) {
+ if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) {
+ adns__query_fail(qu,adns_s_nomemory);
+ return;
+ }
+ adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz,
+ qu->vb.buf,
+ (int(*)(void*, const void*, const void*))qu->typei->diff_needswap,
+ qu->ads);
}
- qu->answer= ans;
- qu->id= -1;
- LIST_LINK_TAIL(ads->output,qu);
+
+ ans->expires= qu->expires;
+ parent= qu->parent;
+ if (parent) {
+ LIST_UNLINK_PART(parent->children,qu,siblings.);
+ qu->ctx.callback(parent,qu);
+ free_query_allocs(qu);
+ free(qu);
+ } else {
+ makefinal_query(qu);
+ LIST_LINK_TAIL(qu->ads->output,qu);
+ }
+}
+
+void adns__query_fail(adns_query qu, adns_status stat) {
+ adns__reset_cnameonly(qu);
+ qu->answer->status= stat;
+ adns__query_done(qu);
+}
+
+void adns__makefinal_str(adns_query qu, char **strp) {
+ int l;
+ char *before, *after;
+
+ before= *strp;
+ if (!before) return;
+ l= strlen(before)+1;
+ after= adns__alloc_final(qu,l);
+ memcpy(after,before,l);
+ *strp= after;
+}
+
+void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) {
+ void *before, *after;
+
+ before= *blpp;
+ if (!before) return;
+ after= adns__alloc_final(qu,sz);
+ memcpy(after,before,sz);
+ *blpp= after;
}
~ianmdlvl / adns.git / blobdiff